腭大孔麻醉
A．暂时性面瘫B．翼静脉丛血肿C．恶心、干呕D．瞳孔缩小E．颌后区血肿 以下麻醉最易引起的相应并发症是
参考答案：C
The first decade in the 21st century _____ the rapid rise of China as a world economic power. [ ]
A. witness
B. has witnessed
C. will witness
D. have witnessed
通话电路的主要作用是把送、受话双向通话的四线传输转化为（）传输。
A.一线
B.二线
C.单向
D.双向
